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PHP 正则表达式
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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: \w</h1> <p>How many alphatbetical or digit characters are in the text "freew3c.com"?:</p> <?php $txt = "freew3c.com"; $pattern = "/\w/"; echo preg_match_all($pattern, $txt); ?> <p>The matches were found here:</p> <?php echo preg_replace($pattern, "#", $txt); ?> <p>(Each match was replaced by a # character)</p> </body> </html>
正则表达式修饰符：\w
文本“W3Schools.com”中有多少个字母或数字字符？
10
匹配项在此处找到
#######.###
（每次匹配都替换为“#”字符）